js-验证码插件gVerify.js

js-验证码插件gVerify.js    原地址：http://www.cnblogs.com/liaobeifeng/p/7085804.html

源码：

!(function(window, document) {    function GVerify(options) { //创建一个图形验证码对象，接收options对象为参数        this.options = { //默认options参数值            id: "", //容器Id            canvasId: "verifyCanvas", //canvas的ID            width: "100", //默认canvas宽度            height: "30", //默认canvas高度            type: "blend", //图形验证码默认类型blend:数字字母混合类型、number:纯数字、letter:纯字母            code: ""        }                if(Object.prototype.toString.call(options) == "[object Object]"){//判断传入参数类型            for(var i in options) { //根据传入的参数，修改默认参数值                this.options[i] = options[i];            }        }else{            this.options.id = options;        }                this.options.numArr = "0,1,2,3,4,5,6,7,8,9".split(",");        this.options.letterArr = getAllLetter();        this._init();        this.refresh();    }    GVerify.prototype = {        /**版本号**/        version: '1.0.0',                /**初始化方法**/        _init: function() {            var con = document.getElementById(this.options.id);            var canvas = document.createElement("canvas");            this.options.width = con.offsetWidth > 0 ? con.offsetWidth : "100";            this.options.height = con.offsetHeight > 0 ? con.offsetHeight : "30";            canvas.id = this.options.canvasId;            canvas.width = this.options.width;            canvas.height = this.options.height;            canvas.style.cursor = "pointer";            canvas.innerHTML = "您的浏览器版本不支持canvas";            con.appendChild(canvas);            var parent = this;            canvas.onclick = function(){                parent.refresh();            }        },                /**生成验证码**/        refresh: function() {            this.options.code = "";            var canvas = document.getElementById(this.options.canvasId);            if(canvas.getContext) {                var ctx = canvas.getContext('2d');            }else{                return;            }                        ctx.textBaseline = "middle";            ctx.fillStyle = randomColor(180, 240);            ctx.fillRect(0, 0, this.options.width, this.options.height);            if(this.options.type == "blend") { //判断验证码类型                var txtArr = this.options.numArr.concat(this.options.letterArr);            } else if(this.options.type == "number") {                var txtArr = this.options.numArr;            } else {                var txtArr = this.options.letterArr;            }            for(var i = 1; i <= 4; i++) {                var txt = txtArr[randomNum(0, txtArr.length)];                this.options.code += txt;                ctx.font = randomNum(this.options.height/2, this.options.height) + 'px SimHei'; //随机生成字体大小                ctx.fillStyle = randomColor(50, 160); //随机生成字体颜色                        ctx.shadowOffsetX = randomNum(-3, 3);                ctx.shadowOffsetY = randomNum(-3, 3);                ctx.shadowBlur = randomNum(-3, 3);                ctx.shadowColor = "rgba(0, 0, 0, 0.3)";                var x = this.options.width / 5 * i;                var y = this.options.height / 2;                var deg = randomNum(-30, 30);                /**设置旋转角度和坐标原点**/                ctx.translate(x, y);                ctx.rotate(deg * Math.PI / 180);                ctx.fillText(txt, 0, 0);                /**恢复旋转角度和坐标原点**/                ctx.rotate(-deg * Math.PI / 180);                ctx.translate(-x, -y);            }            /**绘制干扰线**/            for(var i = 0; i < 4; i++) {                ctx.strokeStyle = randomColor(40, 180);                ctx.beginPath();                ctx.moveTo(randomNum(0, this.options.width), randomNum(0, this.options.height));                ctx.lineTo(randomNum(0, this.options.width), randomNum(0, this.options.height));                ctx.stroke();            }            /**绘制干扰点**/            for(var i = 0; i < this.options.width/4; i++) {                ctx.fillStyle = randomColor(0, 255);                ctx.beginPath();                ctx.arc(randomNum(0, this.options.width), randomNum(0, this.options.height), 1, 0, 2 * Math.PI);                ctx.fill();            }        },                /**验证验证码**/        validate: function(code){            var code = code.toLowerCase();            var v_code = this.options.code.toLowerCase();            console.log(v_code);            if(code == v_code){                return true;            }else{                this.refresh();                return false;            }        }    }    /**生成字母数组**/    function getAllLetter() {        var letterStr = "a,b,c,d,e,f,g,h,i,j,k,l,m,n,o,p,q,r,s,t,u,v,w,x,y,z,A,B,C,D,E,F,G,H,I,J,K,L,M,N,O,P,Q,R,S,T,U,V,W,X,Y,Z";        return letterStr.split(",");    }    /**生成一个随机数**/    function randomNum(min, max) {        return Math.floor(Math.random() * (max - min) + min);    }    /**生成一个随机色**/    function randomColor(min, max) {        var r = randomNum(min, max);        var g = randomNum(min, max);        var b = randomNum(min, max);        return "rgb(" + r + "," + g + "," + b + ")";    }    window.GVerify = GVerify;})(window, document);

使用方法

html

<div id="v_container" style="width: 200px;height: 50px;"></div><input type="text" id="code_input" value="" placeholder="请输入验证码"/><button id="my_button">验证</button>

script

<script src="js/gVerify.js"></script>//引入插件//调用    <script>        var verifyCode = new GVerify("v_container");        document.getElementById("my_button").onclick = function(){            var res = verifyCode.validate(document.getElementById("code_input").value);            if(res){                alert("验证正确");            }else{                alert("验证码错误");            }        }    </script>

实现效果